MICRONICS COMPUTERS, INC.

JX30G

Processor

80486SX/80486DX/80486DX2/Pentium Overdrive

Processor Speed

25/33/50(internal)/66(internal)MHz

Chip Set

Unidentified

Max. Onboard DRAM

64MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit VESA local bus slots (2), floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

PS/2 mouse port

CN1

Speaker

J30

Floppy drive interface

CN2

Power LED & keylock

J31

IDE interface

CN3

Turbo LED

W18

External battery

J8

Turbo switch

W19

Serial port 2

J9

Reset switch

W20

Internal keyboard connector

J13

IDE interface LED

W21

Serial port 1

J14

32-bit VESA Local bus slots

SL1 & SL2

Parallel port

J16

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Clock type select Motorola 126818

W1

Open

 

Clock type select Dallas

W1

Closed

»

Monitor type select color

W2

Closed

 

Monitor type select monochrome

W2

Open

»

On board mouse disabled (IRQ12)

W3

Open

 

On board mouse enabled (IRQ12)

W3

Closed

»

Parity enabled

W4

Closed

 

Parity disabled

W4

Open

»

Dallas clock normal operation

W5

Open

 

Dallas clock discharge

W5

Closed

»

Parallel port mode unidirectional

W7

pins 1 & 2 closed

 

Parallel port mode bidirectional

W7

pins 2 & 3 closed

»

CMOS memory normal operation

W8

pins 2 & 3 closed

 

CMOS memory clear

W8

pins 1 & 2 closed

»

Factory configured - do not alter

W9

Open

»

CPU type select 80486DX/DX2/Pentium Overdrive

W12

pins 2 & 3 closed

 

CPU type select 80486SX

W12

pins 1 & 2 closed

»

PQFP CPU enabled

W13

pins 1 & 2 closed

 

PQFP CPU disabled

W13

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

4MB

(1) 1M x 36

NONE

NONE

NONE

8MB

(1) 1M x 36

(1) 1M x 36

NONE

NONE

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

NONE

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB

(1) 4M x 36

NONE

NONE

NONE

20MB

(1) 1M x 36

(1) 4M x 36

NONE

NONE

24MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

NONE

28MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

32MB

(1) 4M x 36

(1) 4M x 36

NONE

NONE

36MB

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

NONE

40MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

NONE

52MB

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

NONE

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

W10

W11

W22

W23

W24

64KB

1 & 2

1 & 2

2 & 3

2 & 3

1 & 2

128KB

1 & 2

2 & 3

1 & 2

1 & 2

2 & 3

256KB

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (WRITE BACK)

Size

W16

W17

64KB

pins 1 & 2 closed

pins 1 & 2 closed

128KB

pins 1 & 2 closed

pins 2 & 3 closed

256KB

pins 2 & 3 closed

pins 2 & 3 closed

Note: If write through is selected, open jumpers W16 & W17.

CPU SPEED CONFIGURATION

Speed

SW1/1

SW1/2

SW1/3

SW1/4

25MHz

Off

On

Off

Off

33MHz

On

On

Off

Off

50iMHz

Off

On

Off

Off

66iMHz

On

On

Off

Off